adding fibers to concrete mix

you convinced me.

Q: does remash prevent micro-cracking ?

the portion of the floor that i paved and will redo using nothing but concrete and gravel (stupid beginner's mistake) already has some cracks. the rest where i did use reinforcement and insulation is not cracked anywhere.

adding fibers to concrete mix

If you have expansion joints in your concrete, the cracks typically follow the joint(s). I would never substitute rebar for the fibermesh unless the area is too shallow for rebar. We did a job where we repaired some rotted cantilevered breezeways in a condo complex and repoured without rebar and used fibermesh in our pour. We made expansion joints and used sikaflex in the joints to help control the cracks. There was never any cracking of the concrete down the line.

adding fibers to concrete mix

I'm standing with ConcreteMasonary on this one.

just to add to it, if you are not finishing the top of the floor with anything, the concrete is fuzzy until you wear it off by walking or moving stuff on it, if you use metal mesh pieces than I have seen rust stains all over the floor...that does wonders if you acid stain the floor at a later date.

adding fibers to concrete mix

Fibers are never a substitute for wire mesh - PERIOD!!!!
Fibers do not increase the compressive strength of concrete.

That also depends on the situation. You DO NOT want to use wire mesh,rebar or wire gridding on a cantilevered wooden structure such as a breezeway or a flat balcony because the material will pierce the bituthene underlayment and eventually cause a leak.